This is an old classic. And talk about hell on Earth -
the eternal Mother in Law.

In 1959, Mabel Chinnery went to the cemetery to visit her mother's
grave. She took a photo of the grave, then a picture of her husband who was
sitting in the car waiting for her. When the photo was developed, Mrs. Chinney's
mother appeared in the back seat even though she quite dead, laying in the
grave a few dozen feet from the car. The family would often go out for rides
and when living, this is where the the lady would automatically sit.

A photographic expert who examined the photo and negative for
a British paper said he'd stake his reputation and job on his verdict that
the negative wasn't tampered with and the photo was genuine.